Bearing and coupling for drafting rollers of spinning machines



1967 SHIGEMATSU TAKITA 3,295,336

BEARING AND COUPLING FOR DRAFTING ROLLERS OF SPINNING MACHINES Original Filed Jan. 2. 1963 INVENTOR. SH/f/MTSU 721 K/ TA ATTORNEY United States Patent 3,295,336 BEARING AND COUPLHNG FOR DRAFTHNG RULLERS 0F SPINNING MAEIHINES Shigematsu Tairita, 182 Z-chome, Tairarazuka, Hyogo, Japan Original application Jan. 2, 1963, Ser. No. 249,017, now Patent No. 3,240,031, dated Mar. 15, 1966. Divided and this application lFeh. 18, 1965, Ser. No. 462,157 2 Claims. (Cl. 64-9) This is a division of application Serial Number 249,017, filed January 2, 1963, now Patent No. 3,240,031.

This invention relates to spinning machines and, more particularly to the lower drafting or drawing rollers of such machines.

It is the chief object of the invention to provide a sectional lower roller which produces a more uniform and superior quality of yarn than prior art devices.

Another object is to provide a sectional lower roller which practically eliminates severance of yarn.

Yet another object is to provide a roller of the type mentioned which effects the desired results by eliminating transverse vibrations of the roller sections even although consecutive bearings may not be in precise alignment.

Still another object is to provide aroller as aforesaid which effects the desired and superior results by eliminating torsional oscillation and its inevitable concomitant, non-uniform instantaneous peripheral speeds of the several roller sections.

A further object is to provide a sectional roller wherein the sections are loosely connected in end-to-end relation for positive rotation as a unit, and, at the same time, for a slight and limited relative axial rotation as well as for relative angular movement of each section in planes through its axis of rotation, relatively to the next succeeding section.

Another object is to provide a sectional roller as aforesaid which while effecting all of the objects aforesaid, is of indefinite life, wherein each section may be easily removed for repair or replacement without disturbing adjacent sections, and wherein the sections themselves are interconnected by sleeve means which journal the roller sections and so may be replaced or renewed as desired without replacement of the sections themselves.

Other objects and advantages inherent in our invention will become obvious to those skilled in the art, after a study of the following detailed description, in connection with the accompanying drawings.

In the drawings:

FIGURE 1 shows in vertical axial section a form of the invention using plain bearings with oiled packing and plastic seals; and

FIGURE 2 is a section taken in a plane identified by line 2-2, FIGURE 1, looking in the direction of the arrows.

In drawing machines of the type involved, it is highly desirable for a uniform, high-quality product, that all portions of the lower drawing rollers operate at the same peripheral speed. Under such conditions, there results a superior high-quality yarn wherein successive transverse sections of the product are uniform and, as a secondary but highly desirable result, breakage or severance of the yarn is reduced to an absolute minimum.

However, when the lower roller sections are rigidly connected there is a torsional oscillation from one end of the roller to the other, having a period of from 20 to 40 seconds, and a twist or torsion angle of from about 3.5 to 40 and which, under severe conditions, may be as great as This torsional vibration results, in an obvious way, in variation of the instantaneous peripheral speeds of the interconnected sections of the roller and also 3,295,336 Patented Jan. 3, 1967 v the aforesaid torsional vibration results in breakage, severance, fouling of rollers, and consequent loss of time due to the resulting necessary shutdown. When a machine of the type being described, having rigidly-coupled roller sections, is operated at ultra-high speeds, the yarn produced has the equally-undesirable form wherein the nodules are simply of greater length and spacing, so that the resulting yarn is non-uniform and of poor quality.

When as frequently happens, the successive bearings of the lower roller are not properly and accurately aligned, or become out of line in use, the quality of the yarn is even more deleteriously affected due to the fact that the pressure between upper and lower rollers, at any given transverse section, varies as the lower roller vibrates up and down and thus accentuates bunching.

The present invention obviates the drawbacks of prior art drafting devices and produces a superior and high quality of yarn, eliminating the conditions just enumerated by obviating torsional vibration and assuring that each roller section rotates freely in its bearings, and maintains at all times constant pressure against the corresponding portions of the upper roller and with no variation in resistance to rotation.

Referring in detail to the drawing, there is an interconnection between contiguous roller sections 59, displaying a toothed flange 56 at one end and a diametrically grooved flange 56 at the other, such that the tooth of one section has a loose fit within the groove of the next succeeding section. Each section has a reduced hearing portion 57 which are supported in plain bearings of block 60 and held in place by cap 61. The central part of the block and cap are enlarged to conjointly define a compartment for containing a lubricanbsaturated porous or absorbent material 63. Lubricant may be added to space 62 above material '63, through recess 66 in the top of cap 61. Each roller section has, between its flange and its main section, at each end, an intermediate part 58 of a diameter between that of main section 59 and bearing section 57. A seal 64 of soft and pliable synthet ic resin has a neck tightly fitting about part 58, and an integral outwardly-flared skirt whose edge contacts the adjacent side wall of the bearing. Thus these seals operate efliciently to prevent the escape of lubricant and, at the same time, to keep dust out of the bearing.

The operation will be clear from the foregoing description, drawings and appended claims.

The specification describes examples only of the invention for the purposes here disclosed. It is however, intended to cover all changes and modifications of the embodiments shown, and all combinations of the present invention with conventional elements, which do not depart from the spirit and scope of the invention as claimed.

Having now fully disclosed the invention, what I claim and desire to secure by Letters Patent is:

1. In a textile drawing mechanism, a plurality of roller sections each having first and second flanges at its respective ends, said first flange having a tooth extending axially and diametrically from its end face, said second flange having a channel therein extending axially and diametrically, the diametral transverse dimension of said tooth being less than the corresponding dimension of said channel, and a plurality of spaced bearings having an enlarged central chamber, and journaling the contiguous ends of a successive pair of rollers with the flanges thereof in said chamber and the tooth of one flange loosely fitting the channel of the contiguous flange to effect rotation of all sections as a unit while permitting limited relative axial rotation between successive sections, each said bearing having parallel, axially-spaced planar surfaces normal to the axis defined thereby, each flange of each said roller section being defined by a first portion of diameter less than that of the central body portion of the section, there being a second portion between said first portion and said body portion, and having a diameter greater than said first port-ion and less than said body portion, and a pair of seals of flexible material, each tightly fitting a respective one of the second portions of said roller sections, and having an outwardly-flared frusto-conical skirt with its free edge in sliding contact with a planar surface of the contiguous bearing.

2. The mechanism of claim 1, said chamber being filled with an oil-saturated porous material.

References Cited by the Examiner UNITED STATES PATENTS Hitchon 641 Eames et a1 6431 Bee 648 Potter 649 Rime-Bruneau 6431 Northway 649 Tarr 646 FRED C. MATIERN, ]R., Primary Examiner.

MILTON KAUFMAN, BROUGHTON G. DURHAM,

Examiners.

15 H. C. COE, Assistant Examiner. 

1. IN A TEXTILE DRAWING MECHANISM, A PLURALITY OF ROLLER SECTIONS EACH HAVING FIRST AND SECOND FLANGES AT ITS RESPECTIVE ENDS, SAID FIRST FLANGE HAVING A TOOTH EXTENDING AXIALLY AND DIAMETRICALLY FROM ITS END FACE, SAID SECOND FLANGE HAVING A CHANNEL THEREIN EXTENDING AXIALLY AND DIAMETRICALLY, THE DIAMETRAL TRANSVERSE DIMENSION OF SAID TOOTH BEING LESS THAN THE CORRESPONDING DIMENSION OF SAID CHANNEL, AND A PLURALITY OF SPACED BEARINGS HAVING AN ENLARGED CENTRAL CHAMBER, AND JOURNALING THE CONTIGUOUS ENDS OF A SUCCESSIVE PAIR OF ROLLERS WITH THE FLANGES THEREOF IN SAID CHAMBER AND THE TOOTH OF ONE FLANGE LOOSELY FITTING THE CHANNEL OF THE CONTIGUOUS FLANGE TO EFFECT ROTATION OF ALL SECTIONS AS A UNIT WHILE PERMITTING LIMITED RELATIVE AXIAL ROTATION BETWEEN SUCCESSIVE SECTIONS, EACH SAID BEARING HAVING PARALLEL, AXIALLY-SPACED PLANAR SURFACES NORMAL TO THE AXIS DEFINED THEREBY, EACH FLANGE OF EACH SAID ROLLER SECTION BEING DEFINED BY A FIRST PORTION OF DIAMETER LESS THAN THAT OF THE CENTRAL BODY PORTION OF THE SECTION, THERE BEING A SECOND PORTION BETWEEN SAID FIRST PORTION AND SAID BODY PORTION, AND HAVING A DIAMETER GREATER THAN SAID FIRST PORTION, AND LESS THAN SAID BODY PORTION, AND A PAIR OF SEALS OF FLEXIBLE MATERIAL, EACH TIGHTLY FITTING A RESPECTIVE ONE OF THE SECOND PORTIONS OF SAID ROLLER SECTIONS, AND HAVING AN OUTWARDLY-FLARED FRUSTO-CONICAL SKIRT WITH ITS FREE EDGE IN SLIDING CONTACT WITH A PLANAR SURFACE OF THE CONTIGUOUS BEARING. 